Thread-cutting and clamping mechanism



y 11, 1950 E. KlELCZEWSKl ET AL 2,515,045

THREAD CUTTING AND CLAMFING MECHANISM Filed March 6, 1948 2 Sheets-Sheet 1 f INVENTORS EDWARD L KIELCZEWSKI B ROBERT e. MALLARD Y fbM-w ATTORNEY July 11, 1950 E. L. KIELCZEWSKI ET AL 2,515,045

THREAD CUTTING AND CLAMPING MECHANISM 2 Sheets-Sheet 2 Filed March 6, 1948 INVENTORS EDWARD KIELCZEWSKI ROBERT o. MALLARD ATTORNEY Patented July 11, 1 950 THREAD-CUTTING AND 'CLAMPING MECHANISM Edward L. iKielczewski, Kearny, N.J., .and.Robert G. Mallard, Staten Island, :N. Y., assignors to The M. W.=Kellogg Company, Jersey City, N. J a corporation of Delaware Application March 6, 1948, Serial No. 13,454

.16 Glaims.

Thepresent invention relates to atthread cutting and clamping mechanism employed in 2a loom in connection'with ra'filling replenishing motion for cutting thefilling end onanexhausted bobbin prior to a transfer operation and for clamping'the severedfillingend extending to the cloth.

Generally, .in looms of the 'fly shuttle type, when replenishing of filling,- or yarn, is effected, the filling endextends :from the cloth selvage through the eye ofthe-shuttle to thespent bobbin. When the fresh bobbin'is'insertedin the shuttle, not only must the spent bobbin bevremovedbut the shuttle :eye mustbe cleared to" allow the yarn from the'nevv bobbinto be threaded'properly in the eye. .To accomplishthis, the yarn extending from the selvage oi the-cloth must heart as closely as possible to theshuttle eye, so that the spent bobbin, in .being ejected, will draw the short length :of yarn left extending from the shuttle through the shuttle eye, leaving the latter entirely: clear and. free. .The outgoing: filling: end is not only severed nearthe shuttle but is clamped .nearthe severed end,:.so'that;.it.may be withdrawn out of the rangevoi the weaving instrumentalities simultaneously with the transfer operation and held inithis withdrawn .position untilthe' temple thread cuttercuts theyarnclose to the selvage. ThereLis. accordingly. provided in such: looms. a movable bladezcarrierhaving severing and: clamping blades mounted infront of the shuttle boxaat the replenishing 'sideofthe-loom.

Tihese blades are moved .by theicarrier to filling receiving position, i. .e., .rearwardly .towarcl'the shuttle box, prior to eachl'transfer.operationsand are withdrawn forwardly :from such iposition simultaneouslywith 'the transfer operation.

Hitherto vtheiclamping of theyarn has been effected by the 'crossingaction of the opposed edges of a pairuofi relatively movable blades, one of whichwas ofmetal whilethe other of fiber or similar comparatlvelysoft material to prevent shearing of the yarn. A ia: result of this construction, the fiber blade wore out quickly and required toibe continually. replaced.

Also, in prior known constructions,-the-blade carrie was "operated from the transfer arm through a series of :links or othersimilartdevices which were not only comparatively complicated but in their operation were. attended withslackness, adversely affecting the -'efilcient i operation of the cutting andJcIamping :blades.

- One object'lof the present invention i itofprovide a new and improved thread cutting and elampin'gmechanismin whi'chtheoppose'd clamp- 2 ing lblades, :although i of hard rigid .material, do not cut the severed end of the thread therebetweenzas-they cross,1-but effectively hold the thread .until the next thread: cutting operation.

.Another object iszto. provide anew and improved comparatively simplethread cutting andclampingmechanisni operated from-the starting rod,

through acomparativelysimple device free from the usual'slack connections,whentransfer is indicated.

Various other objects of the invention will be apparent :from the following particular description'andirom aniinspectionzof the accompanying drawings, .in which .Figure 1 is:a longitudinal .sectionoftheloom near the replenishing side .of .the .lloom showing a .thread:cutting and clampingmechanism tembodying :the rpresent. invention "andindicatedrin thread cutting. and clampingposition;

.Figure.2 .is a horizontaLsection of the m taken approximately .along :the ,lines ;:22 of Figure 1;

Figure 3 is a sectionofthe thread: cutting and clampingmechanism taken. approximately along the lines 3-3 of Figure 2, but showing this mechanism prior to initiation of-transfer;

Figure 4 is a section similar to that of Figure 3 but showing the mechanismv after transfer has been indicated and after the cutting and clamping blades have been moved rearwardly into operative position in the shuttle box;

Figure 5 is a sectionsimilarto that of Figur 4 but showing the shuttle box in forwardposition to close the cutting and clamping blades;

Figure 6. isa detail side viewpartlyinsection and partlyin side elevation ofpart of the thread cutting and clamping mechanism;

Figure 7 is a detail plan view showing the mounting ior'the cutting and'clamping blades;

Figure 8 --isiaxside.elevation, on an enlarged scale, of the thread cuttingisideof the blades;

.1946. Onxtheright Ioomside: lzfi and also onathe vbreastbeam .(notrshown); isthe rotatable hopper cut;

. 30 through a rock shaft 4-2.

or magazine I3 of the transfer, or replenishing, mechanism supported on a stand I i. The hopper I3 carries reserve bobbins (not shown) in an annular series and may be of any suitable wellknown construction.

The loom is provided with the usual lay |5 reciprocable therealong and carrying on its right side and underneath the hopper l3 the usual filling replenishing shuttle box l6 provided with a bottom opening H for the ejection therethrough, of the spent filling bobbin Hi from a shuttl 25.-

The front box plate 2| has an opening 22 adjacent to the position of the shuttle eye when the shuttle is properlyboxed in the shuttle box [5. The opening 22 extends along the front box plate 2|, slopes upwardly towards the left side of the loom and is open at its left hand end the blade mounting block 3 5.

The sleeve 5|,is rotatively urged on the shaft 42 by a coil spring 55, one end of which is secured to said sleeve, while the other end is secured 'to a collar 55 affixed to said shaft as, for example, by a set screw 5'1". The coil spring 55 is torsionally stressed to urge the sleeve 5| counterclockwise relative to the shaft 42 and thereby to urge the blade. carrier 32 rearwardly (to the to permit the severed clamped filling thread to 1 be cleared from the shuttle box It, as said b'ox moves rearwardly with-the lay I5 after thread severing and clamping operations, as will be more fully described.

The shuttle 20 has the usual cut-away portion or slot 25 in the front wall thereof adapted for partial registry with the opening 22 of the front shuttle box wall 2|, so that when the thread cutter is in its operative rearward position and the cuttingblades extend through said opening and said slot, and are open, the outgoing filling end will rest between said blades ready .to be The operation of the replenishing. or transfer mechanism is controlled by a starting .rod .30 suitably supported in journals onthe loomsides,

as shown, or on the forward side of. the breast.

beam. Whenever the substantial exhaustion of the filling is indicated by a feeler mechanism, a partial revolution is given .to the starting rod this sets the transfer mechanism for .transfer. The transfer mechanism with .its starting rod 30 may be .ofthe usual type.'

. The thread cutting and clamping machanism comprises a blade carrier 32 located in front of the shuttle box IE and dire'ctedforforwardand rearward movement by a guide 33. The. blade carrier 32 'comprisesa blade mounting block 34 and a tailrod 35 passing through the guide 3,3

with a snug slide'fit.

' The guide 33 is integral or otherwise rigid with the lower end of an arm- 36 depending-from a fixed rod 3'1 and formed at is upper end with a sleeve 38. This sleeve embraces the rod 37 and is afiixed thereto in adjusted position as, for example, by set screws 40.

As a feature of the present invention,'the blade carrier 32, instead of being reciprocated asusual through a comparatively complicated device from the'shaft of the transfer arm, is operated more simply'and more directly from the starting rod extends in front of the'lay l5 substantially parallel to the-longitudinal axis thereof and is supported near its inner end in; spaced bearings #33 in the hopper stand l4 and at its outer end in a bearing 44 sustained from the rod 31' The rod 31 is parallel to the rock shaft 12 and is affixed near itsinner end in the hopper stand 14. The outer end of the rod 31has-secured thereto, as

for example, by a set screw 4B,'one end 41 of an arm 48, the other end constituting the bearing M for the outer end of the row shaft 42.

The blade carrier 32 is urged rearwardly towards. the shuttle box It by the rockshaft 42.

i To that end, thereissupported on the rock shaft 42 a dependin arm .55 having atits upper. end a;

The rock shaft 42 against such rotation by a stop in the form of a collar held fast to the shaft 42. as, for example, by a:set screw GI, and having a slot 62, into which extends a. pin 63 secured to the r0- tative sleeve 5|. The slot 62 is larger in width than the diameter of the pin 63 to form, for the purpose to be more fully described, a lost-motion connection between the sleeve 5| and the shaft 52.

The shaft 42 is normally held against rotation by the starting rod 30 through crank arms 65 and secured to the starting rod 30 and the shaft 42 respectively and pivotally interconected at their outer ends by a link 66.

During normal operations of the loom, and

7 while no transfer is indicated, the starting rod 30 is in position to hold the collar 6? in the position shown in Figure. 3. In this position, the pin 63 bears against the right hand side of the slot 62 in the stop collar 60, so that the blade position shown in Figure 1, thereby rotating the shaft 42 counterclockwise and causing thereby the collar 50 afiixed to said shaft to rotate from the position shown in Figure 3 to the position shown in Figure 4. This results in the release of the sleeve 5| for counterclockwise rotation under the action of thespring 55 thereby rotates the arm 50 with said sleeve counterclockwise from the position shown in Figure 3 to the position shown in Figure. 4. This operation moves the blade carrier 32 rearwardly towards the shuttle box It into operative position.

The lost motion connection between the collar 60 and the sleeve 5| through the slot 62 and the pin 63, permits the shipper arm 50 to move clockwise from the position shown in Figure 4 to the position shown in Figure 5, without affecting the rotative position of the shaft 42, when the blade carrier. 32 is pushed forwardly by the forward movement of the lay I5, as will be more fully described.

The blade carrier 32 comprising the block 34 mounts a pair of spaced blades 10 and H of rigid material, such as metal. The blade 10 is a thread, cutting blade, while the blade H is a thread clamping blade... For blade mounting pur poses, the block 34 has integral or otherwise rigid therewith a rearward "plate extension 72. The thread cutting blade 70 is affixed to the plate extension 12 by rivets 13, or other similar fastening members (Fig. .7). The clamping blade H is yieldably supported in fixed position against edge'wis'e movement on the pla'te extension 12 in a manner to be described.

As a feature of the present invention, instead of providing a movable blade of'rigid material such as metal for thread cutting cooperation with the fixed cutting blade and a separate fiber blade for thread clamping cooperation with the fixed clamping blade 'i l, as in prior known-constructions, there is provided a single movable blade 15 of rigid material such as metal, disposed between said blades 10 and H and cooperating therewith to cut the thread and clamp the cut thread end. The movable blade 15 is pivotally supported on a pin 16 in the manner to be described, and is substantially thicker than the thickness of either of the two blades 10 and H, as shown in Figure 10. The clamping blade H has a square lower side 11 defining a clamping edge l8 on the inner face 80 of said blade. The cutting blade Ill has a lower bevelled side 8| slanting downwardly towards the movable blade and defining a cutting edge 82 on the inner face 83 of said blade. The movable blade'l5 has a, bevelled side 84 slanting upwardly towards the clamping blade H and defining on one face '85 a clamping edge 86 for cooperation with the clampin edge 18 on the fixed blade I I, and on its other face 8? a cutting edge 88 for cooperation with the cutting edge 82 on the fixed cutting blade 70. The di'iierent cutting and clamping edges are so arranged that as the movable blade 15 is moved pivotally for cutting and clamping operations, the clamping edges 18 and 86 located on the side of the device nearest to the cloth first come together across the outgoingfillingend A, as shown in Figure 10, while the cutting edges 82 and 88 are still spaced apart. As the blade it continues to move into overlapping relationship with respect to the fixed clamping blade H, the filling A becomes clamped between the confronting faces 86 and 85 of said blades. Upon continued pivotal movement of the blade 15, the cutting edges 82 and 88 will cross and shear the filling therebetween. By that time, the end of the severed filling A will have been firmly clamped between the blades H and 15.

It has been found that two relatively crossable rigid blades with edges extending almost parallel at the instant they cross each other will not cut a thread therebetween but will instead clamp the thread between their confronting faces. Applying this discovery to the structure of the present invention, the clamping-edges 13 and 86 are made to extend substantially parallel as they cross, as shown in Figure '9, and diverge only slightly towards their outer ends to prevent these outer ends from coming together before the inner parts of said edges have started to cross. If these edges at their outer ends should come together before the inner parts of the clamping edges '38 and 86 start to cross, and if these outer ends should overlap transversely of the planes of the blades, these outer ends might-catch'and prevent operation of the'device.

The cutting edges 82 and 88 diverge at a substantial angle towards their outer ends, as'in the case of an ordinarypair of scissors, to cause said edges to cross progressively from their inner ends outwardly.

The blades H and I5 are-mounted on a pivot pin it having a reduced end threaded into the plate extension 2'2. A The shank 92"ofpin Hiis mouth and is of such asizerelative'to the holes in blades l that these -can-slidealong the length of said shank while bladelfi can pivot relative thereto. The blades 1| and is are'y'ield- 'ably'pressedtogether and towards blade 10 by a spring in the form of fingers bearing at their free ends against blade H and bearing at the center against the slotted head 9| on the pivot pin 16.

The pawl 94 isoperated by a trip 96 pivoted at 91 in a'rece'ss-9B formed in a trip support "it.

The trip 96 has integral or otherwise rigid therewith a counterweight lEll tending to maintain said trip 'in upstanding position as shown in Figure 6. A stop conformation m2 in the trip support 19!! serves to limit clockwise rotation ofthe trip 96 in the position shown in Figure 6, while permitting said trip to swing idly counterclockwise from said position. To permit this counterclockwise rotationoi the trip 96 from the position shown'in Fig. 6, the end wall 99 of the groove 98 is'inclined upwardly and away from the shuttle box-2i).

The memberlilll serves not only as a support for the trip 96 but also asa slide support for the blade carrier 32 as said carrier moves hori zontally, and is carried by the guide 33 through a rod extension [93 on said member extending through a hole in said guide and adjustably retained therein by set screws IM.

Fortripping the pawl for blade closing operations, the front box plate 2! has on its outer side, over the opening 22, a bunter I85.

For limiting theangular movement of the blade l5 about its pivot support 15, there is provided a stop pin 5% passing through an elongated arcuate slotit'l in the movable blade extension and retained at one end, as, for example, by apress-fit in the carrier plate extension 12. At its other end, the pin I06 passes with a slide fit through the clamping blade H. The pin 565 serves thereby not only as a means for limiting the pivotal movement of the blade it but also serves in conjunction with the pin "it to mount the clamping blade 1i against edgewise movement.

In the operation of the thread cutting and clamping mechanism, during the normal operationof the loom and while no transfer is indicated, the shaft $2 is held in the rotative position shown inii'ig. 3 by its connection to the starting rod The arm fill is thereby held in the angular position shown in Fig. 3 and the blades it, E! and "iii are held in forward inoperative position, out of the way of the reeipro eating lay l5. As soon as transfer is indicated, the starting rod 3% is rotated counterclockwise, thereby rotating the arm til into the position shown in Fig. 4 by the torsional action of the spring 55, and shifting the blade carrier 32 rear- Wardly towards the lay it. As the blade carrier 32 is so moved rearw'ardly, the pawl 9:. is cammed by the trip tit while said trip is held in upright position by the stop Hill, as shown in Fig. 6. This tripping of the pawl 9*? causes the blade '15 to be rotated clockwise inopen position about its pivot support H3, as shown in Fig. 6.

The movable blade 15 is frictionally held between the blades Hi and El by the spring 96, so that Said movable blade will retain its an gular position determined by the tripping of one of the pawls 9d and 95 until angularly shifted by the tripping of other of said pawls.

While the blades is, 1| and 15 are in rearward position and the blade I 5 is in open position shown in Figure 4, the lay I5 on its next forward beat-up movement, will cause said blades to pass through the openings 22 and 25 in the front box plate 2! and shuttle 20, respectively, and to locate the filling end A between the movable blade I5 on one side and the blades I and 'II on the other side. As the lay I continues its forward movement, the bunter I05 engages the pawl 95 and rotates the blade 75 into closed position, as .shown in Figure 5. This operation clamp the filling end between the blades II and I5 and cuts the filling end between the blades I6 and I5. Immediately after the closing of the blade 15, the transfer of a reserve bobbin from the hopper I 3 to the shuttle box I6 and the simultaneous ejection of the eX- hausted bobbin through the box opening I I takes place.

As the lay I5 continues its forward movement, it pushes the blade carrier 32 forwardly without affecting the rotative position of the shaft 42. This forward movement of the blade carrier 32 is permitted because of the lost-motion connection 60, 62 and 63 between the sleeve 5i and the shaft 42, as already described.

After the lay I 5 reaches its forward position, it begins its rearward movement, thereby causing the severed clamped end of the filling A to be pulled out through the opening 22 in the front box plate 2I and to be withdrawn out of range of the weaving instrumentalities. During this rearward movement of the lay I5, the starting rod 30 is returned to its original rotative position. This operation causes the shaft 42 to rotate clockwise from the position shown in Figure 5 and causes the arm 50 thereby to continue to rotate clockwise by the pressing engagement of the right hand end of the slot 52 on the shaft collar 60 against the pin 63 on the arm carrying sleeve 5|. The continued clockwise rotation of the arm '58 continues to move the blade carrier 32 forwardly with the blades Ill, II and I5 closed and the severed filling clamped between the blades "II and I5. As the pawl 94 rides past the trip 96, said trip is swung counterclockwise about its pivot support 91 without disturbing the closed angular position of the blade I5. As the pawl 9 3 moves forwardly beyond the trip 96, the released trip is returned into the upright position shown in Figure 6 by the action of the counterweight IEII. The blade carrier 32 is moved forwardly by the shaft :32 into the inoperative position shown in Figure 3, until the next transfer operation. While in this inoperative forward position and while the severed filling end is held between the closed blades II and I5, the filling is severed near the cloth selvage by the usual temple thread cutter (not shown) and will be released from said blades, when these blades are again opened during the next thread cutting and clamping operation upon the next indication of transfer.

While the invention has been described with particular reference to a specific embodiment, it is to be understood that it is not to be limited thereto but is to be construed broadly and restricted solely by the scope of the appended claims.

What is claimed is:

1. In a thread cutting and clamping mechanism for a loom having a starting rod which is partially rotated when transfer is indicated, and a lay supported shuttle box with an opening in a Wall plate thereof, the combination comprising a shaft, a connection between said rod and said shaft,v causing said shaft to rotate partially upon partial rotation of said rod resulting from a transfer indication, a thread cutting and clamping device opposite said opening, an arm supported on said shaft and operatable to move said thread cutting and clamping device towards and away from said shuttle box, a connection between said shaft and said arm causing said arm to move into angular position to shift aid thread cutting and clamping device in one direction towards said shuttle box upon partial rotation of said starting rod resulting from a transfer indication, whereby said device is madeto enter said shuttle box through said opening for thread cutting and clamping action a said shuttle box is moved to-. wards said thread cutting device by the reciprocation of the lay, means for operating said thread cutting and clamping device for thread cutting and clamping operations while said device extends through said opening, and means for moving said thread cutting and clamping device in an opposite direction after the thread has been cut and clamped, to withdraw the cut and clamped filling thread from said shuttle box through said opening.

2-. In a thread cutting and clamping mechanism for a loom, the combination as described in claim 1, in which said starting rod extends across the loom, and said shaft extends substantially parallel to said rod in front of the lay, said thread cutting and clamping device extending in front of said opening and comprising a slidable blade, carrier, said arm depending from said shaft and having at its lower end a connection to said blade carrier.

3. In a thread cutting and clamping mechanism of the character described in claim 1, in which the connection between said arm and said shaft is of the lost-motion type, causing said arm to'move angularly in a direction to move the thread, cutting and clamping device towards said shuttle box into operative position, when said shaft is partially rotated from an inoperative position in one direction by a transfer indication, and permitting said arm to be moved angularly in an opposite direction to a limited extent without affecting. rotation of said shaft in an opposite direction, whereby the return of said shaft to its original inoperative position is controlled by the return of said starting rod to its original inoperative position.

4. 'In a thread cutting mechanism for a loom having a lay supported shuttle box with an opening in a wall plate thereof, the combination comprising a shaft, means responsive to a transfer impulse for rotating said shaft in one direction including means .normally holding said shaft against rotation in said direction, a blade carrier, and a connection between said carrier and said shaft including spring means urging said carrier in said direction relative to said shaft and means normally effective to prevent movement of said carrier relative to said shaft in said direction under the infiuenceof'said spring means and effective upon rotation of said shaft due to a transfer impulse to permit said carrier to move in said direction towards said opening into operative position under the influence of said spring means.

5. In a thread cutting mechanism for a loom as described in claim 4, in which said carrier is -moved by the lay in an opposite direction for part of its return trip, and said connection is of the lost-motion type permitting said carrier to be moved by he lay said latter direetion for partof the return tripofsaidcarrier, without disturbing therotative positionof said shaft.

6. In a thread cutting mechanism for a loom as described'in claim 4, said spring means comprising a coil spring embracing said shaft, said connection comprising a sleeve member on said shaft rotatable thereon, an arm rigid with said sleeve member and connected to said blade carrier, and a collar member affixed to said shaft, one of said members having a pin and the other member having aslotin which said pin extends with clearance to form a lost-motion drive connection between said members, one end of said spring being rigid with said shaft, the other end being secured to said sleeve, said spring being torsionally stressed to urge said sleeve rotatively, said carrier being movable bythe lay in an opposite direction for part of its return trip, and said lost-motion connection being operatable to permit said carrier to be moved by the layinsaid latter direction for part of the return trip of said carrier without disturbing the rotative position of saidshaft.

'7. In a thread cutting mechanism for a loom as described in clai 4, said holding means comprising a starting rod journalled across the loom and partially rotated by feeler means indicating substantial exhaustion-of filling, said shaft being parallel to said rod, andsaid holding means comprising a crank arm and link connection between said rod and said shaft.

8. In a thread cutting and clamping mechanism for a loom having a lay supported shuttle box with an opening in a wall plate thereof, the combination comprising a fixed rod extending crosswise of the loom, a blade carrier opposite said opening having a tail extension, thread cutting and clamping blades on said carrier including at least one blade movable with respect to the other blades and said carrier, a guide for the slide movement of said tail extension supported from said rod, a shaft parallel to said rod, a bearing for said shaft supported from said rod, means for rotating said shaft partially in response to a transfer impulse, an arm carried by said shaft and connected to said carrier to move said carrier towards said opening into operative position upon said partial rotation of said shaft, whereby said blades are moved into position to pass through said opening during the lay movement of said shuttle box towards said blade carrier, while said shuttle box is moving in one di rection towards said carrier, means for moving said movable blade into open position, as said carrier is moved towards said shuttle box, means for moving said movable blade into closed thread cutting and clamping position after passing through said opening, and means for moving said blade carrier towards inoperative position after cutting and clamping operations.

9. In a thread cutting mechanism for a loom having a starting rod which extends crosswise of the loom and which is partially rotated when transfer is indicated, and a lay supported shuttle box, the combination comprising a shaft parallel to said rod, a fixed rod parallel to said shaft, a bearing for said shaft supported from said fixed rod, a slidable blade carrier, a guide for said carrier supported from said fixed rod for guiding said carrier in its slide movement towards and away from said shuttle box, a connection between said starting rod and said shaft for rotating said shaft partially upon partial rotation of said starting rod resulting from a transfer indication, and a connection between said shaft and saidblade carrierfor moving said carrier towards said shuttle box into operative position and for withdrawing said carrier towards inoperative position after completion of cutting operations.

10. In a thread cutting mechanism for a loom having a lay supported shuttle box, a blade carrier, a pair of thread cutting blades on said carrier, one of saidblades being mountedfor movement in and out of cutting position with respect to the other blade, means for guiding said carrier for movement towards and away from said shuttle. boxinto and out of operative position, said movable blade having a pair of pawls, a trip in the path of movement of one of said pawls for moving said movable blade into open position with re -v spect to theother blade, as said carrier moves towardssaid shuttle box, a bunter on said shuttle box for the other pawl to move said movable blade into thread cutting position, while said blade carrier is in operative position, means sre sponsive to a transfer indication for moving said blade carrier towards operative position, and;

means for moving said blade carrier towards m operative positionafter cutting operations have been completed,

11. In athread cutting mechanism for a loom, as described in claim 10, said shuttle box having a front wallplate with an opening therein, said blade carrier being mounted towards and away from said shuttle box into and out of operative position, said blades being adapted to extend through said opening in operative position, and said bunter being on the outside of said plate on one side of said opening.

12. In a thread cutting mechanism for a loom, as described in claim 10, said shuttle box having a front wall plate with an opening therein, said blade carrier being adapted for substantially horizontal movement in front of said shuttle box into and out of operative position, said blade opening pawl being disposed in the upper side of said movable blade while the other pawl is on the lower side, said trip being disposed below said movable blade in the path of movement of said latter pawl, said bunter being disposed on the outside of said plate above said opening, said blades being adapted to extend through said opening in operative position.

13. In a thread cutting mechanism for a loom having a lay supported shuttle box, a blade carrier, a pair of thread cutting blades on said carrier, one of said blades being mounted for closing and opening movement into and out of cutting position with respect to the other blade, means for guiding said blade carrier for movement towards and away from said shuttle box into out of operative position, said movable blade having a pawl, a pivotally mounted trip in the path of movement of said pawl for moving said movable blade into open position with respect to the other blade as said blade carrier moves towards said shuttle box, a stop for limiting the angular movement of said trip about its pivotal mounting as said pawl engages said trip during the movement of said blade carrier towards said shuttle box into operative position, means tending to maintain said trip in operative position towards said stop, said trip being adapted to swing idly about its pivotal mounting by the engaging action of said pawl during the return movement of said blade carrier from operative position, means for closing said movable blade into thread cutting position while said blade carrier is in operative position, means responsive to a transfer indication for moving said blade carrier towards opf or movement erative position, and means for moving said blade carrier towards inoperative position after cutting operations have been completed. 7 g i 14. In a thread cutting mechanism for a loom having a lay supported shuttl box, a blade carrier adapted to slide towards and away from said shuttle box, a pair of cutting blades, at least one of which is pivotally mounted and has a pawl extension, a blade carrier support along which said blade carrier is adapted to slide in its movement towards and away from said shuttle box, a trip pivotally mounted on said support and normally extending into the path of movement of said pawl extension to move said pivoted blade into open position as said blad carrier moves towards said shuttle box into operative position, a stop on said support limiting pivotal movement of said trip and determining. the operative position of said trip, and means normally urging said trip towards said stop and into operative position in the path of movement of said pawl extension, said urging means being yieldable to permit said trip to swing idly against the action of said trip urging means as said pawl extension engages said trip during the return movement of said blade carrier towards inoperative position.

15. In a thread cutting mechanism for a loom, the combination as described in claim 14, in which said yieldable urging means is a counterweight rigid with said trip and tending to maintain said trip in operative position towards said stop,

16. In a thread'cutting mechanism for a loom, the combination as described in claim 14, in which said support is located below said blade carrier and has a groove in which said trip is pivotally mounted, one end of said groove having a wall on the side of said trip opposite said shuttle box inclined upwardly and away from said shuttle box with respect to the vertical, said yieldable urgin means comprising a counterweight at one end normally tending to maintain said trip in operative upright position, the section of said wall nearest said trip defining said stop.

EDWARD L. KIELCZEWSKI. ROBERT GVMALLARD.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,515,515 Northrop Nov. 11, 1924 1,552,388 Stafford Sept. 1, 1925 1,575,779 Marshall Mar. 9, 1926 1,591,289 Davis July 6, 1926 2,329,999 Miller 'Sept. 21, 1943 2,389,471. Turner Nov. 20, 1945 FOREIGNPATENTS Number Country Date Great Britain May21, 1929 

